Skip to content

Latest commit

 

History

History
225 lines (167 loc) · 9.19 KB

athena.md

File metadata and controls

225 lines (167 loc) · 9.19 KB
Raw
title
Amazon Athena

Amazon Athena

To add a database connection, click on the gear icon in the top right, and navigate to Admin settings > Databases > Add a database.

Connecting to Athena

To connect Metabase to Athena, you'll need to input your IAM credentials:

  • Access key
  • Secret Key

Metabase will encrypt these credentials.

If you use other AWS services, we recommend that you create a special AWS Service Account that only has the permissions required to run Athena, and input the IAM credentials from that account to connect Metabase to Athena.

See Identity and access management in Athena.

Connecting using AWS Default Credentials Chain

If you're running Metabase on AWS and want to use AWS Default Credentials Chain, leave the Access and Secret keys blank.

In both cases, the Athena driver will automatically fetch session credentials based on which IAM role you've configured.

Settings

You can edit these settings at any time. Just remember to save your changes.

Display name

The display name for the database in the Metabase interface.

Region

The AWS region where your database is hosted, for Amazon Athena. For example, you might enter us-east-1.

Workgroup

AWS workgroup. For example: primary. See documentation on workgroups.

S3 Staging directory

This S3 staging directory must be in the same region you specify above.

Access key

Part of IAM credentials for AWS. Metabase will encrypt these credentials.

If you're running Metabase on AWS and want to use AWS Default Credentials Chain, leave the Access and Secret keys blank.

Secret Key

Part of IAM credentials for AWS. Metabase will encrypt these credentials.

Additional Athena connection string options

You can specify additional options via a string, e.g. UseResultsetStreaming=0;LogLevel=6.

Re-run queries for simple explorations

Turn this option OFF if people want to click Run (the play button) before applying any Summarize or filter selections.

By default, Metabase will execute a query as soon as you choose an grouping option from the Summarize menu or a filter condition from the drill-through menu. If your database is slow, you may want to disable re-running to avoid loading data on each click.

Choose when Metabase syncs and scans

Turn this option ON to manage the queries that Metabase uses to stay up to date with your database. For more information, see Syncing and scanning databases.

Database syncing

If you've selected Choose when syncs and scans happen > ON, you'll be able to set:

  • The frequency of the sync: hourly (default) or daily.
  • The time to run the sync, in the timezone of the server where your Metabase app is running.

Scanning for filter values

Metabase can scan the values present in each field in this database to enable checkbox filters in dashboards and questions. This can be a somewhat resource-intensive process, particularly if you have a very large database.

If you've selected Choose when syncs and scans happen > ON, you'll see the following options under Scanning for filter values:

  • Regularly, on a schedule allows you to run scan queries at a frequency that matches the rate of change to your database. The time is set in the timezone of the server where your Metabase app is running. This is the best option for a small database, or tables with distinct values that get updated often.
  • Only when adding a new filter widget is a great option if you want scan queries to run on demand. Turning this option ON means that Metabase will only scan and cache the values of the field(s) that are used when a new filter is added to a dashboard or SQL question.
  • Never, I'll do this manually if I need to is an option for databases that are either prohibitively large, or which never really have new values added. Use the Re-scan field values now button to run a manual scan and bring your filter values up to date.

Periodically refingerprint tables

Periodic refingerprinting will increase the load on your database.

Turn this option ON to scan a sample of values every time Metabase runs a sync.

A fingerprinting query examines the first 10,000 rows from each column and uses that data to guesstimate how many unique values each column has, what the minimum and maximum values are for numeric and timestamp columns, and so on. If you leave this option OFF, Metabase will only fingerprint your columns once during setup.

Permissions and IAM Policies

Most issues that we see when people attempt to connect to AWS Athena involve permissions. Querying AWS Athena requires permissions to:

  • AWS Athena.
  • AWS Glue.
  • The S3 bucket where Athena results are stored.
  • The resources that Athena is querying against (i.e., the S3 bucket(s) Athena is querying).
  • If you're using AWS Lake Formation, then you also need to grant AWS Lake Formation permissions through the AWS Console (AWS Lake Formation > Permissions > Data Lake Permissions > Grant data lake permissions; the role Metabase uses needs SELECT and DESCRIBE table permissions).

Example IAM Policy

This policy provides read-only permissions for data in S3. You'll need to specify any S3 buckets that you want Metabase to be able to query from as well as the S3 bucket provided as part of the configuration where results are written to.

There may be additional permissions required for other Athena functionality, like federated queries. For details, check out the Athena docs.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Athena",
      "Effect": "Allow",
      "Action": [
        "athena:BatchGetNamedQuery",
        "athena:BatchGetQueryExecution",
        "athena:GetNamedQuery",
        "athena:GetQueryExecution",
        "athena:GetQueryResults",
        "athena:GetQueryResultsStream",
        "athena:GetWorkGroup",
        "athena:ListDatabases",
        "athena:ListDataCatalogs",
        "athena:ListNamedQueries",
        "athena:ListQueryExecutions",
        "athena:ListTagsForResource",
        "athena:ListWorkGroups",
        "athena:ListTableMetadata",
        "athena:StartQueryExecution",
        "athena:StopQueryExecution",
        "athena:CreatePreparedStatement",
        "athena:DeletePreparedStatement",
        "athena:GetPreparedStatement"
      ],
      "Resource": "*"
    },
    {
      "Sid": "Glue",
      "Effect": "Allow",
      "Action": [
        "glue:BatchGetPartition",
        "glue:GetDatabase",
        "glue:GetDatabases",
        "glue:GetPartition",
        "glue:GetPartitions",
        "glue:GetTable",
        "glue:GetTables",
        "glue:GetTableVersion",
        "glue:GetTableVersions"
      ],
      "Resource": "*"
    },
    {
      "Sid": "S3ReadAccess",
      "Effect": "Allow",
      "Action": ["s3:GetObject", "s3:ListBucket", "s3:GetBucketLocation"],
      "Resource": [
        "arn:aws:s3:::bucket1",
        "arn:aws:s3:::bucket1/*",
        "arn:aws:s3:::bucket2",
        "arn:aws:s3:::bucket2/*"
      ]
    },
    {
      "Sid": "AthenaResultsBucket",
      "Effect": "Allow",
      "Action": [
        "s3:PutObject",
        "s3:GetObject",
        "s3:AbortMultipartUpload",
        "s3:ListBucket",
        "s3:GetBucketLocation"
      ],
      "Resource": ["arn:aws:s3:::bucket2", "arn:aws:s3:::bucket2/*"]
    }
  ]
}

If Metabase also needs to create tables, you'll need additional AWS Glue permissions. The "Resource": "*" key-value pair gives the account Delete and Update permissions to any table:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "VisualEditor0",
      "Effect": "Allow",
      "Action": [
        "glue:BatchCreatePartition",
        "glue:UpdateDatabase",
        "glue:DeleteDatabase",
        "glue:CreateTable",
        "glue:CreateDatabase",
        "glue:UpdateTable",
        "glue:BatchDeletePartition",
        "glue:BatchDeleteTable",
        "glue:DeleteTable",
        "glue:CreatePartition",
        "glue:DeletePartition",
        "glue:UpdatePartition"
      ],
      "Resource": "*"
    }
  ]
}

Further reading